ENGLISH HOBNAIL No. 555 by Westmoreland Glass Co.

Westmoreland's 1910/12 catalog shows a limited number of items available in this No. 555 pattern but aka English Hobnail, for the most part, is considered a depression glass pattern.
It was made into the 1940s then more pieces in milk glass were introduced during circa 1960s. A few pieces were once again made during the 1980s.

Reproductions:
A creamer and sugar with a hexagonal foot has been reproduced, as well as, a nut bowl and a pickle dish.

Reference: (some info used but dates revised due to finding the 1910/12 catalog at the Rankow Library) from Gene Florence: Collectors Encyclopedia of Depression Glass - 15th Edition and Warman's Depression Glass Field Guide.